LS6511(2002) Просмотр технического описания (PDF) - LSI Computer Systems
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LS6511 Datasheet PDF : 4 Pages
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FIGURE 2. TYPICAL RELAY APPLICATION
NOTE 1: The relay coil is normally energized and the LED is off.
When an alarm occurs, the relay coil becomes de-energized and
the LED is turned on.
R3
C3
R1 = See NOTE 2
R2 = 36kΩ
R3 = 2.7MΩ
R4 = 36kΩ
R5 = 2.7MΩ
R6 = 2.2MΩ (Typical)
R7 = 2.2MΩ (Typical)
R8 = 2.2MΩ (Typical)
R9 = 3kΩ
R10 = 2.2kΩ (Typical)
-
+ C4
1
AMP 1
OUT
AMP 1 14
(-)IN
R4
2 AMP 2
(-)IN
C5
R5
AMP 1 13
(+)IN
V DD
R6
V DD
C6
3 AMP 2
OUT
12
5V REG
OUT
4 DIG FILTER
RC
V DD 11
R7
C7
V DD
5
See Note 3
CP MODE or
DP MODE RC
10
V SS
LS6511
R8
LED/REL 9
6 DUR TIM
OUT
C8
RC
V DD
S
7
MODE
LED/REL 8
OUT
S = 3-Position SPDT (On-Off-On)
+
- C2
R2
R9
C9
+
C1 -
PIR
SENSOR
RAW
DC
INPUT
R1
C1 = 100µF
C2 = 33µF
C3 = 0.01µF
C4 = 33µF
C5 = 0.01µF
C6 = 0.01µF (Typical)
C7 = 0.22µF (CP Mode; Typical)
C7 = 0.68µF (DPMode; Typical)
C8 = 0.22µF (Typical)
C9 = 0.1µF
D1 = 1N4001
RELAY = No typical P/N
PIR = HEIMANN LHi 958, 968 (Typical)
All Resistors 1/4W. All Capacitors 10V.
RELAY
COIL
D1
R10
NOTE 2: R1 is selected to provide sufficient
current to drive the LS6511 and PIR Sensor. Any
surplus current is available to drive additional
loads applied to the 5V Shunt Regulator output or
is absorbed by the 5V Shunt Regulator. Refer to
specifications for current limits.
LED
NOTE 3: In SP Mode, R7 and C7 are not used
and Pin 5 is tied to Vss.
NOISE CONSIDERATIONS
Layout of any circuit using a high-gain PIR amplifier is critical.
The PIR amplifier components should be located close to the
amplifier pins on the chip in order to minimize noise pickup.The
oscillator and relay drive components should be located away
from the amplifier components.
Other steps that can help reduce noise is adding a ground
shield backplane to the PCB and enhancing the filtering of
VDD; i.e., adding a 0.1uF high frequency capacitor across C1
and increasing C1 to 220 µF.
FIGURE 3. INHIBITING OUTPUTS UPON POWER TURN-ON
V DD
100k
+
220µF
R6
2.2M
C6
.01µF
LS6511 - 4
Using the typical application circuit as shown in Figure 2,
the Outputs on Pins 8 and 9 occur on power-up because of
the large settling time in the amplifier stages. In applications
where this is not desireable, the digital filter oscillator must
be disabled on power-up long enough to enable the PIR
amplifiers to stabilize. Replacing the R6-C6 circuit shown in
Figure 2 with the circuit shown in Figure 3 will disable the
digital filter oscillator until the voltage across the 220µF
capacitor reaches a value high enough for the oscillator to
begin oscillating. Component values that can be changed to
speed up stabilization include C2, C3, C4 and C5. C3 and
C5 become 0.001µF and C2 and C4 become 10µF.
6511-102402-3
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